New app: Spectrum Painter (#988)

* added spectrum painter app
2025-08-14 05:17:39 +00:00 · 2023-05-14 23:09:43 +02:00
parent a27881ecd6
commit b4da86d491
24 changed files with 1457 additions and 21 deletions
--- a/firmware/common/ui.hpp
+++ b/firmware/common/ui.hpp
@@ -57,6 +57,16 @@ struct Color {
 		)}
 	{
 	}
+
+	uint8_t to_greyscale() {
+		uint32_t r = ((v >> 11) & 31U) << 3;
+		uint32_t g = ((v >> 5)  & 63U) << 2;
+		uint32_t b = (v         & 31U) << 3;
+
+		uint32_t grey = (r * 299 + g * 587 + b * 114) / 1000;
+
+		return (uint8_t)grey;
+	}
 	
 	Color operator-() const {
 		return (v ^ 0xffff);